In a box like this, you will need to plug the box in between two sensors (usually rail pressure and boost pressure) and the box will then fool the ECU into injecting more fuel and running a higher boost pressure. This means you are very likely to see an improvement on your dashboard display, but may not see the same improvement at the fuel station.Ī ‘twin channel’ tuning box intercepts and changes two signals rather than one. Many of these tuning boxes claim better fuel economy - but a major reason for this is that the engine is being fooled into delivering more fuel than the ECU actually is aware of. The second problem with fooling the engine in this way is that it will throw out all the complex calculations in the ECU which keep all the systems running correctly. These are some of the most expensive components in a diesel engine, and repairs can run into the thousands. If that resistor value is wrong however, it can cause increased wear or a catastrophic failure of the high pressure fuel pump or injectors. If there is only a mild increase in pressure, then it is unlikely that it will cause any damage. The spec of this resistor is critically important to whether the system is safe. It is this resistor which fools the ECU into a false reading.
Inside these fancy shiny boxes, usually there is nothing more than a resistor (costing pence from any electronics supplier). This all sounds great, but there are two main problems. Increased rail pressure means the engine will get more fuel and make more power.
They are usually placed between the rail pressure sensor and the ECU to reduce the reading the ECU receives, in turn making the engine run with increased rail pressure. The easiest sensor to fool in order to guarantee more fuel being injected is the rail pressure sensor, and this is the one most tuning boxes target. (Take a look at our blog on engine control later).Ī tuning box is designed to intercept and change signals back to the ECU, to fool it into making changes which result in more fuel being injected. They do this by taking advantage of the Closed Loop Control systems in the engine. Diesel tuning boxes make all these claims and more - so what are they? Are they really a viable alternative to a custom remap?Īt its heart a tuning box is an incredibly simple device, which has existed in various forms for many years, but always using the same principle to achieve the power increase.
There is absolutely no risk to your engine whatsoever, the gains are comparable to a remap, and it’s totally undetectable - if you need to take your car back to the dealer, just unplug the box and it will be like it was never there. Instantly you have more power, torque and better fuel economy. Secure the box somewhere safe in the engine bay. You open the bonnet of your car, locate the correct plugs, and plug it in. Imagine a small black box and a couple of cables.
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